arch/powerpc/platforms/ps3/htab.c

   1 /*
   2  *  PS3 pagetable management routines.
   3  *
   4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   5  *  Copyright 2006, 2007 Sony Corporation
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22
  23 #include <asm/machdep.h>
  24 #include <asm/lmb.h>
  25 #include <asm/udbg.h>
  26 #include <asm/lv1call.h>
  27 #include <asm/ps3fb.h>
  28
  29 #include "platform.h"
  30
  31 #if defined(DEBUG)
  32 #define DBG udbg_printf
  33 #else
  34 #define DBG pr_debug
  35 #endif
  36
  37 static struct hash_pte *htab;
  38 static unsigned long htab_addr;
  39 static unsigned char *bolttab;
  40 static unsigned char *inusetab;
  41
  42 static DEFINE_SPINLOCK(ps3_bolttab_lock);
  43
  44 #define debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g) \
  45         _debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g, __func__, __LINE__)
  46 static void _debug_dump_hpte(unsigned long pa, unsigned long va,
  47         unsigned long group, unsigned long bitmap, struct hash_pte lhpte,
  48         int psize, unsigned long slot, const char* func, int line)
  49 {
  50         DBG("%s:%d: pa     = %lxh\n", func, line, pa);
  51         DBG("%s:%d: lpar   = %lxh\n", func, line,
  52                 ps3_mm_phys_to_lpar(pa));
  53         DBG("%s:%d: va     = %lxh\n", func, line, va);
  54         DBG("%s:%d: group  = %lxh\n", func, line, group);
  55         DBG("%s:%d: bitmap = %lxh\n", func, line, bitmap);
  56         DBG("%s:%d: hpte.v = %lxh\n", func, line, lhpte.v);
  57         DBG("%s:%d: hpte.r = %lxh\n", func, line, lhpte.r);
  58         DBG("%s:%d: psize  = %xh\n", func, line, psize);
  59         DBG("%s:%d: slot   = %lxh\n", func, line, slot);
  60 }
  61
  62 static long ps3_hpte_insert(unsigned long hpte_group, unsigned long va,
  63         unsigned long pa, unsigned long rflags, unsigned long vflags,
  64         int psize, int ssize)
  65 {
  66         unsigned long slot;
  67         struct hash_pte lhpte;
  68         int secondary = 0;
  69         unsigned long result;
  70         unsigned long bitmap;
  71         unsigned long flags;
  72         unsigned long p_pteg, s_pteg, b_index, b_mask, cb, ci;
  73
  74         vflags &= ~HPTE_V_SECONDARY; /* this bit is ignored */
  75
  76         lhpte.v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M) |
  77                 vflags | HPTE_V_VALID;
  78         lhpte.r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize) | rflags;
  79
  80         p_pteg = hpte_group / HPTES_PER_GROUP;
  81         s_pteg = ~p_pteg & htab_hash_mask;
  82
  83         spin_lock_irqsave(&ps3_bolttab_lock, flags);
  84
  85         BUG_ON(bolttab[p_pteg] == 0xff && bolttab[s_pteg] == 0xff);
  86
  87         bitmap = (inusetab[p_pteg] << 8) | inusetab[s_pteg];
  88
  89         if (bitmap == 0xffff) {
  90                 /*
  91                  * PTEG is full. Search for victim.
  92                  */
  93                 bitmap &= ~((bolttab[p_pteg] << 8) | bolttab[s_pteg]);
  94                 do {
  95                         ci = mftb() & 15;
  96                         cb = 0x8000UL >> ci;
  97                 } while ((cb & bitmap) == 0);
  98         } else {
  99                 /*
 100                  * search free slot in hardware order
 101                  *      [primary]       0, 2, 4, 6, 1, 3, 5, 7
 102                  *      [secondary]     0, 2, 4, 6, 1, 3, 5, 7
 103                  */
 104                 for (ci = 0; ci < HPTES_PER_GROUP; ci += 2) {
 105                         cb = 0x8000UL >> ci;
 106                         if ((cb & bitmap) == 0)
 107                                 goto found;
 108                 }
 109                 for (ci = 1; ci < HPTES_PER_GROUP; ci += 2) {
 110                         cb = 0x8000UL >> ci;
 111                         if ((cb & bitmap) == 0)
 112                                 goto found;
 113                 }
 114                 for (ci = HPTES_PER_GROUP; ci < HPTES_PER_GROUP*2; ci += 2) {
 115                         cb = 0x8000UL >> ci;
 116                         if ((cb & bitmap) == 0)
 117                                 goto found;
 118                 }
 119                 for (ci = HPTES_PER_GROUP+1; ci < HPTES_PER_GROUP*2; ci += 2) {
 120                         cb = 0x8000UL >> ci;
 121                         if ((cb & bitmap) == 0)
 122                                 goto found;
 123                 }
 124         }
 125
 126 found:
 127         if (ci < HPTES_PER_GROUP) {
 128                 slot = p_pteg * HPTES_PER_GROUP + ci;
 129         } else {
 130                 slot = s_pteg * HPTES_PER_GROUP + (ci & 7);
 131                 /* lhpte.dw0.dw0.h = 1; */
 132                 vflags |= HPTE_V_SECONDARY;
 133                 lhpte.v |= HPTE_V_SECONDARY;
 134         }
 135
 136         result = lv1_write_htab_entry(0, slot, lhpte.v, lhpte.r);
 137
 138         if (result) {
 139                 debug_dump_hpte(pa, va, hpte_group, bitmap, lhpte, psize, slot);
 140                 BUG();
 141         }
 142
 143         /*
 144          * If used slot is not in primary HPTE group,
 145          * the slot should be in secondary HPTE group.
 146          */
 147
 148         if ((hpte_group ^ slot) & ~(HPTES_PER_GROUP - 1)) {
 149                 secondary = 1;
 150                 b_index = s_pteg;
 151         } else {
 152                 secondary = 0;
 153                 b_index = p_pteg;
 154         }
 155
 156         b_mask = (lhpte.v & HPTE_V_BOLTED) ? 1 << 7 : 0 << 7;
 157         bolttab[b_index] |= b_mask >> (slot & 7);
 158         b_mask = 1 << 7;
 159         inusetab[b_index] |= b_mask >> (slot & 7);
 160         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 161
 162         return (slot & 7) | (secondary << 3);
 163 }
 164
 165 static long ps3_hpte_remove(unsigned long hpte_group)
 166 {
 167         panic("ps3_hpte_remove() not implemented");
 168         return 0;
 169 }
 170
 171 static long ps3_hpte_updatepp(unsigned long slot, unsigned long newpp,
 172         unsigned long va, int psize, int ssize, int local)
 173 {
 174         unsigned long flags;
 175         unsigned long result;
 176         unsigned long pteg, bit;
 177         unsigned long hpte_v, want_v;
 178
 179         want_v = hpte_encode_v(va, psize, MMU_SEGSIZE_256M);
 180
 181         spin_lock_irqsave(&ps3_bolttab_lock, flags);
 182
 183         hpte_v = htab[slot].v;
 184         if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
 185                 spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 186
 187                 /* ps3_hpte_insert() will be used to update PTE */
 188                 return -1;
 189         }
 190
 191         result = lv1_write_htab_entry(0, slot, 0, 0);
 192
 193         if (result) {
 194                 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
 195                        __func__, va, slot, psize, result, result);
 196                 BUG();
 197         }
 198
 199         pteg = slot / HPTES_PER_GROUP;
 200         bit = slot % HPTES_PER_GROUP;
 201         inusetab[pteg] &= ~(0x80 >> bit);
 202
 203         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 204
 205         /* ps3_hpte_insert() will be used to update PTE */
 206         return -1;
 207 }
 208
 209 static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
 210         int psize, int ssize)
 211 {
 212         panic("ps3_hpte_updateboltedpp() not implemented");
 213 }
 214
 215 static void ps3_hpte_invalidate(unsigned long slot, unsigned long va,
 216         int psize, int ssize, int local)
 217 {
 218         unsigned long flags;
 219         unsigned long result;
 220         unsigned long pteg, bit;
 221
 222         spin_lock_irqsave(&ps3_bolttab_lock, flags);
 223         result = lv1_write_htab_entry(0, slot, 0, 0);
 224
 225         if (result) {
 226                 DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
 227                        __func__, va, slot, psize, result, result);
 228                 BUG();
 229         }
 230
 231         pteg = slot / HPTES_PER_GROUP;
 232         bit = slot % HPTES_PER_GROUP;
 233         inusetab[pteg] &= ~(0x80 >> bit);
 234         spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
 235 }
 236
 237 static void ps3_hpte_clear(void)
 238 {
 239         int result;
 240
 241         DBG(" -> %s:%d\n", __func__, __LINE__);
 242
 243         result = lv1_unmap_htab(htab_addr);
 244         BUG_ON(result);
 245
 246         ps3_mm_shutdown();
 247         ps3_mm_vas_destroy();
 248
 249         DBG(" <- %s:%d\n", __func__, __LINE__);
 250 }
 251
 252 void __init ps3_hpte_init(unsigned long htab_size)
 253 {
 254         long bitmap_size;
 255
 256         DBG(" -> %s:%d\n", __func__, __LINE__);
 257
 258         ppc_md.hpte_invalidate = ps3_hpte_invalidate;
 259         ppc_md.hpte_updatepp = ps3_hpte_updatepp;
 260         ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
 261         ppc_md.hpte_insert = ps3_hpte_insert;
 262         ppc_md.hpte_remove = ps3_hpte_remove;
 263         ppc_md.hpte_clear_all = ps3_hpte_clear;
 264
 265         ppc64_pft_size = __ilog2(htab_size);
 266
 267         bitmap_size = htab_size / sizeof(struct hash_pte) / 8;
 268
 269         bolttab = __va(lmb_alloc(bitmap_size, 1));
 270         inusetab = __va(lmb_alloc(bitmap_size, 1));
 271
 272         memset(bolttab, 0, bitmap_size);
 273         memset(inusetab, 0, bitmap_size);
 274
 275         DBG(" <- %s:%d\n", __func__, __LINE__);
 276 }
 277
 278 void __init ps3_map_htab(void)
 279 {
 280         long result;
 281         unsigned long htab_size = (1UL << ppc64_pft_size);
 282
 283         result = lv1_map_htab(0, &htab_addr);
 284
 285         htab = (__force struct hash_pte *)ioremap_flags(htab_addr, htab_size,
 286                                             pgprot_val(PAGE_READONLY_X));
 287
 288         DBG("%s:%d: lpar %016lxh, virt %016lxh\n", __func__, __LINE__,
 289                 htab_addr, (unsigned long)htab);
 290 }